我的应用使用uiwebview加载网页，它随机崩溃，我们无法重现它， 寄存器lr和pc是一样的，堆栈是否被破坏？
崩溃堆栈看起来像这样：
0 libsystem_platform.dylib 0x000000019557845c __os_lock_corruption_abort
1 CFNetwork 0x0000000182f4c890 URLConnectionLoader::_loaderEvent_AckBytes(long long)
2 CFNetwork 0x0000000182e791b4 URLConnectionClient::_internal_captureDataArray()
3 CFNetwork 0x0000000182e78f24 invocation function for block in URLConnectionClient_Classic::_delegate_didReceiveDataArray()
4 CFNetwork 0x0000000182f4550c invocation function for block in URLConnectionClient_Classic::_withDelegateAsync(char const*, void (_CFURLConnection*, CFURLConnectionClientCurrent_VMax const*) block_pointer)
5 CFNetwork 0x0000000182e67ac8 RunloopBlockContext::_invoke_block(void const*, void*)
6 CoreFoundation 0x0000000183408cdc CFArrayApplyFunction + 68
7 CFNetwork 0x0000000182e67974 RunloopBlockContext::perform()
8 CFNetwork 0x0000000182e67828 MultiplexerSource::perform()
9 CFNetwork 0x0000000182e67654 MultiplexerSource::_perform(void*)
10 CoreFoundation 0x00000001834e0240 ___CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
11 CoreFoundation 0x00000001834df4e4 ___CFRunLoopDoSources0
12 CoreFoundation 0x00000001834dd594 ___CFRunLoopRun
13 CoreFoundation 0x00000001834092d4 CFRunLoopRunSpecific + 396
14 WebCore 0x0000000191e04894 RunWebThread(void*)
15 libsystem_pthread.dylib 0x000000019557fdc8 __pthread_body
16 libsystem_pthread.dylib 0x000000019557fd24 __pthread_body
17 libsystem_pthread.dylib 0x000000019557cef8 thread_start + 4
x0: 0x0000000170154214 x1: 0x0000000170154208 x2: 0x0000000170184030 x3: 000000000000000000
x4: 000000000000000000 x5: 000000000000000000 x6: 0x00000001704882c0 x7: 0x0000000000000fd0
x8: 0x0000000000019000 x9: 0x0000000026303831 x10: 0x0000000195f0b000 x11: 0x0000000300000003
x12: 0x00000001700768f0 x13: 0x000001a595f0df89 x14: 0x68a34dca3dfae422 x15: 0x00000000000000c8
x16: 0x00000001957d83b4 x17: 0x00000001840ba268 x18: 000000000000000000 x19: 0x0000000170154214
x20: 0x0000000000000001 x21: 0x0000000000000001 x22: 0x0000000000000002 x23: 0x00000001740afb40
x24: 0x0000000000000001 x25: 0x0000000000000001 x26: 0x0000000195c50e52 x27: 0x0000000195c5d13c
x28: 000000000000000000 fp: 0x0000000105ebaa80 lr: 0x00000001957d845c
sp: 0x0000000105ebaa50 pc: 0x00000001957d845c